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KVM: change the way how lowest priority vcpu is calculated

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The new way does not require additional loop over vcpus to calculate
the one with lowest priority as one is chosen during delivery bitmap
construction.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov 2009-03-05 16:34:59 +02:00 committed by Avi Kivity
parent 343f94fe4d
commit e1035715ef
6 changed files with 22 additions and 61 deletions
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15
arch/ia64/kvm/kvm-ia64.c
View File

@ -1836,20 +1836,9 @@ int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
return 0;
}
struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
unsigned long *bitmap)
int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
{
struct kvm_vcpu *lvcpu = kvm->vcpus[0];
int i;
for (i = 1; i < kvm->arch.online_vcpus; i++) {
if (!kvm->vcpus[i])
continue;
if (lvcpu->arch.xtp > kvm->vcpus[i]->arch.xtp)
lvcpu = kvm->vcpus[i];
}
return lvcpu;
return vcpu1->arch.xtp - vcpu2->arch.xtp;
}
int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,

1
arch/ia64/kvm/lapic.h
View File

@ -22,6 +22,7 @@ int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest);
int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda);
int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
int short_hand, int dest, int dest_mode);
int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2);
bool kvm_apic_present(struct kvm_vcpu *vcpu);
int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 dmode, u8 trig);

2
arch/x86/include/asm/kvm_host.h
View File

@ -286,6 +286,7 @@ struct kvm_vcpu_arch {
u64 shadow_efer;
u64 apic_base;
struct kvm_lapic *apic; /* kernel irqchip context */
int32_t apic_arb_prio;
int mp_state;
int sipi_vector;
u64 ia32_misc_enable_msr;
@ -400,7 +401,6 @@ struct kvm_arch{
struct hlist_head irq_ack_notifier_list;
int vapics_in_nmi_mode;
int round_robin_prev_vcpu;
unsigned int tss_addr;
struct page *apic_access_page;

43
arch/x86/kvm/lapic.c
View File

@ -338,8 +338,9 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
struct kvm_vcpu *vcpu = apic->vcpu;
switch (delivery_mode) {
case APIC_DM_FIXED:
case APIC_DM_LOWEST:
vcpu->arch.apic_arb_prio++;
case APIC_DM_FIXED:
/* FIXME add logic for vcpu on reset */
if (unlikely(!apic_enabled(apic)))
break;
@ -416,43 +417,9 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
return result;
}
static struct kvm_lapic *kvm_apic_round_robin(struct kvm *kvm, u8 vector,
unsigned long *bitmap)
int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
{
int last;
int next;
struct kvm_lapic *apic = NULL;
last = kvm->arch.round_robin_prev_vcpu;
next = last;
do {
if (++next == KVM_MAX_VCPUS)
next = 0;
if (kvm->vcpus[next] == NULL || !test_bit(next, bitmap))
continue;
apic = kvm->vcpus[next]->arch.apic;
if (apic && apic_enabled(apic))
break;
apic = NULL;
} while (next != last);
kvm->arch.round_robin_prev_vcpu = next;
if (!apic)
printk(KERN_DEBUG "vcpu not ready for apic_round_robin\n");
return apic;
}
struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
unsigned long *bitmap)
{
struct kvm_lapic *apic;
apic = kvm_apic_round_robin(kvm, vector, bitmap);
if (apic)
return apic->vcpu;
return NULL;
return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
}
static void apic_set_eoi(struct kvm_lapic *apic)
@ -908,6 +875,8 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu)
vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP;
apic_update_ppr(apic);
vcpu->arch.apic_arb_prio = 0;
apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
"0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
vcpu, kvm_apic_id(apic),

3
virt/kvm/ioapic.h
View File

@ -64,10 +64,9 @@ static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
return kvm->arch.vioapic;
}
struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
unsigned long *bitmap);
int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
int short_hand, int dest, int dest_mode);
int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2);
void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode);
int kvm_ioapic_init(struct kvm *kvm);
int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level);

19
virt/kvm/irq_comm.c
View File

@ -47,7 +47,7 @@ void kvm_get_intr_delivery_bitmask(struct kvm *kvm, struct kvm_lapic *src,
int dest_id, int dest_mode, bool low_prio, int short_hand,
unsigned long *deliver_bitmask)
{
int i;
int i, lowest = -1;
struct kvm_vcpu *vcpu;
if (dest_mode == 0 && dest_id == 0xff && low_prio)
@ -64,15 +64,18 @@ void kvm_get_intr_delivery_bitmask(struct kvm *kvm, struct kvm_lapic *src,
dest_mode))
continue;
__set_bit(i, deliver_bitmask);
if (!low_prio) {
__set_bit(i, deliver_bitmask);
} else {
if (lowest < 0)
lowest = i;
if (kvm_apic_compare_prio(vcpu, kvm->vcpus[lowest]) < 0)
lowest = i;
}
}
if (low_prio) {
vcpu = kvm_get_lowest_prio_vcpu(kvm, 0, deliver_bitmask);
bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
if (vcpu)
__set_bit(vcpu->vcpu_id, deliver_bitmask);
}
if (lowest != -1)
__set_bit(lowest, deliver_bitmask);
}
static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,